Yeh I really don't think that's the case. There may be less coming than before but they are still coming.
There are alot of factors and I know nothing about your company. In short, if people can hire illegals they will. They can pay them less, probably not give benefits, and work them to the ground. Then, those that are following the law are either forced to break the law and hire illegals or go out of business. You can't compete when you are paying legal employees a good wage, providing healthcare and paying all the associated taxes.
It may be extremely beneficial to the business owner who has a team of illegals busting their ass for nickels but it's not good for the framer who has to accept less pay or be replaced.
These are not hard concepts. I was a contractor myself but there are very few illegals in my area and they gravitate to landscaping. I know a landscape contractor with all illegals who makes 300k a year. All I had to worry about was guys without insurance, experience, and skill undercutting me for beer money.